| Project/Area Number |
22K20451
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| Research Category |
Grant-in-Aid for Research Activity Start-up
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| Allocation Type | Multi-year Fund |
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| Review Section |
0303:Civil engineering, social systems engineering, safety engineering, disaster prevention engineering, and related fields
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| Research Institution | National Institute of Technology, Toyota College |
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Principal Investigator |
Ogasawara Akinobu 豊田工業高等専門学校, 環境都市工学科, 助教 (30962972)
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| Project Period (FY) |
2022-08-31 – 2024-03-31
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| Project Status |
Completed (Fiscal Year 2023)
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| Budget Amount *help |
¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
Fiscal Year 2023: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2022: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
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| Keywords | 補強土壁 / 凍上 / 地震 / 複合外力 / 耐震性能 / 遠心模型実験 |
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| Outline of Research at the Start |
本研究では，凍上・融解履歴を受けた補強土壁の地震時被災メカニズムの解明および，補強土壁の耐震性変化に与える凍上・融解の影響の明示化に取り組む．そのために，補強土壁模型に凍上・融解履歴を与えて遠心力場加振実験を行い，加振後の変形挙動や模型地盤内の間隙水圧計，圧力計，補強材への作用力などの測定結果から，複合外力条件下における補強土壁の耐震性について検討を行う．
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| Outline of Final Research Achievements |
There have been reports of reinforced soil walls constructed in snowy and cold regions where the reinforcing materials have failed and wall panels have fallen due to freezing of the ground. However, the seismic performance of reinforced soil walls subjected to repeated freezing and thawing is still unknown.
The purpose of this study is to elucidate the seismic failure mechanism of reinforced soil walls that have been subjected to freeze-thaw cycles. A series of centrifuge model experiments were conducted to investigate the effects of freezing and thawing on the seismic performance of reinforced soil walls. The results showed that the initial deformation caused by one cycle of freezing and thawing history did not result in large deformation due to earthquake motion. It was confirmed that the initial displacement caused by the freeze-thaw action does not necessarily reduce the seismic performance of reinforced soil walls.
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| Academic Significance and Societal Importance of the Research Achievements |
積雪寒冷環境にある補強土壁の地震時被災メカニズムの解明および，凍上・融解履歴が補強土壁の耐震性に与える影響の評価とその対策の立案は喫緊の課題と言える．しかし，凍上を受けた場合の補強土壁の全体的な変形挙動や補強材への作用力などの基本的なことすら不明な点が多く，凍結・融解履歴の有無による補強土壁の耐震性能に関する検討は手つかずの状態である．そのため，積雪寒冷環境にある補強土壁の凍上・融解作用によって変化した耐震性能を把握することは，経済的な対策工の決定に資する貴重な基礎データとなる．
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